So I need some advice

I’m 20 years old and have worked in retail on and off since I was 16. I currently work in a retail shop and started this job in 2019 December. This job as caused so much stress and think it’s time for me to move on with a different job just for a fresh start, I just can not carry on with the stress anymore and I don’t really get on with my work colleagues as they are much older.

I have £10k saved so I don’t think I’m stressed about money.

I feel guilty and useless if I quit but I want to go to uni anyways to get a better job.

Should I feel guilty for having a month off work to look for another job?

My stress started before Christmas and I don’t know what to do any advice would be appreciated